| The 325 produces more power for the same reason I just posted in another thread. The exhaust goes from a 2 to 1 at the cats just like a 318 exhaust. where as the 325 is 2 pipes all the way to the muffler like the 328/M3. So switch out the mid pipe and you have the same HP as a 325.
__________________ 
Supersprint Race | Streamline Filter | Streamline Air Duct | Autosolutions SSK | OEM ZCP 245/275 RE01-R |